[Added] support for pptx

README.md

@@ -2,7 +2,18 @@ Document File Text Extractor
 =============================
 
 Simple Rust library to extract readable text from specific document format like Word Document (docx).
-Currently only support for docx and xlsx, other format coming soon.
+Currently only support several format, other format coming soon.
+
+Supported Document
+-------------------------
+
+
+- [x] Microsoft Word (docx)
+- [x] Microsoft Excel (xlsx)
+- [x] Microsoft Power Point (pptx)
+- [ ] OpenOffice Writer (odt)
+
+
 
 Usage
 ------

src/lib.rs

@@ -29,8 +29,10 @@ extern crate quick_xml as xml;
 pub mod msdoc;
 pub mod docx;
 pub mod xlsx;
+pub mod pptx;
 
 
 pub use msdoc::MsDoc;
 pub use docx::Docx;
-pub use xlsx::Xlsx;
+pub use xlsx::Xlsx;
+pub use pptx::Pptx;

src/pptx.rs

@@ -0,0 +1,128 @@
+
+use zip::ZipArchive;
+
+use xml::reader::Reader;
+use xml::events::Event;
+
+use std::path::{Path, PathBuf};
+use std::fs::File;
+use std::io::prelude::*;
+use std::io;
+use std::clone::Clone;
+use zip::read::ZipFile;
+
+use msdoc::MsDoc;
+
+pub struct Pptx {
+    path: PathBuf,
+    data: String,
+    offset: usize
+}
+
+impl MsDoc<Pptx> for Pptx {
+    fn open<P: AsRef<Path>>(path: P) -> io::Result<Pptx> {
+        let file = File::open(path.as_ref())?;
+        let mut archive = ZipArchive::new(file)?;
+
+        let mut xml_data = String::new();
+//        let xml_data_list = Vec::new();
+
+        for i in 0..archive.len(){
+            let mut c_file = archive.by_index(i).unwrap();
+            if c_file.name().starts_with("ppt/slides") {
+                let mut _buff = String::new();
+                c_file.read_to_string(&mut _buff);
+                xml_data += _buff.as_str();
+//                break
+            }
+        }
+
+
+        let mut buf = Vec::new();
+        let mut txt = Vec::new();
+
+        if xml_data.len() > 0 {
+            let mut to_read = false;
+            let mut xml_reader = Reader::from_str(xml_data.as_ref());
+            loop {
+                match xml_reader.read_event(&mut buf){
+                    Ok(Event::Start(ref e)) => {
+                        match e.name() {
+                            b"a:p" => {
+                                to_read = true;
+                                txt.push("\n".to_string());
+                            },
+                            b"a:t" => {
+                                to_read = true;
+//                                txt.push("\n".to_string());
+                            },
+                            _ => (),
+                        }
+                    },
+                    Ok(Event::Text(e)) => {
+                        if to_read {
+                            let text = e.unescape_and_decode(&xml_reader).unwrap();
+//                            println!("# {} #", text);
+                            txt.push(text);
+                            to_read = false;
+                        }
+                    },
+                    Ok(Event::Eof) => break, // exits the loop when reaching end of file
+                    Err(e) => panic!("Error at position {}: {:?}", xml_reader.buffer_position(), e),
+                    _ => (),
+                }
+            }
+        }
+
+        Ok(
+            Pptx {
+                path: path.as_ref().to_path_buf(),
+                data: txt.join(""),
+                offset: 0
+            }
+        )
+    }
+
+}
+
+impl Read for Pptx {
+    fn read(&mut self, mut buf: &mut [u8]) -> io::Result<usize> {
+        let bytes = self.data.as_bytes();
+        let limit = if bytes.len() < self.offset + 10 {
+            bytes.len()
+        }else{
+            self.offset + 10
+        };
+
+        if self.offset > limit {
+            Ok(0)
+        }else{
+
+            let rv = buf.write(&bytes[self.offset..limit])?;
+//            println!("offset: {}, limit: {}, rv: {}", self.offset, limit, rv);
+            self.offset = self.offset + rv;
+            Ok(rv)
+        }
+    }
+}
+
+
+#[cfg(test)]
+mod tests {
+    use std::path::{Path, PathBuf};
+    use super::*;
+
+    #[test]
+    fn instantiate(){
+        let _ = Pptx::open(Path::new("data/sample.pptx"));
+    }
+
+    #[test]
+    fn read(){
+        let mut f = Pptx::open(Path::new("data/sample.pptx")).unwrap();
+
+        let mut data = String::new();
+        let len = f.read_to_string(&mut data).unwrap();
+        println!("len: {}, data: {}", len, data);
+    }
+}